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参数资料
| 型号： | TAS5518PAGRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 45/105页 |
| 文件大小： | 1514K |
| 代理商： | TAS5518PAGRG4 |
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TAS5518 Controls and Status
36
SLES115 — August 2004
TAS5518
The number of channels that are affected by the BKND_ERR signal is dependent upon the 6-channel
configuration signal. If the I2C setting 6-channel configuration is false, the TAS5518 places all eight PWM
outputs in the PWM backend error state, while not affecting any other internal settings or operations. If the
I2C setting six configuration is true, the TAS5518 brings the PWM outputs 16 to a backend error state, while
not affecting any other internal settings or operations. Table 24 shows the device output signal states during
backend error.
Table 24. Device Outputs During Backend Error
SIGNAL
SIGNAL STATE
Valid
Low
PWM P-outputs
M-State low
PWM M-outputs
M-State low
HPPWM P-outputs
M-State low
HPPWM M-outputs
M-State low
SDA
Signal Input (not driven)
2.2.4 Speaker / Headphone Selector (HP_SEL)
The HP_SEL terminal enables the headphone output or the speaker outputs. The headphone output receives
the processed data output from DAP and PWM channels 1 and 2.
In 6-channel configuration this feature does not affect the two lineout channels.
When low, the headphone output is enabled. In this mode the speaker outputs are disabled. When high, the
speaker outputs are enabled and the headphone is disabled.
Changes in the pin logic level results in a state change sequence using soft mute to the hard mute (M) state
for both speaker and headphone followed by a soft unmute.
When HP_SEL is low, the configuration of channels 1 and 2 are defined by the headphone configuration
register. When HP_SEL is high, the channel 1 and 2 configuration registers define the configuration of
channels 1 and 2.
2.2.5 Mute (MUTE)
The mute control provides a noiseless volume ramp to silence. Releasing mute provides a noiseless ramp
to previous volume. The TAS55508 has both a master and individual channel mute commands. A terminal
is also provided for the master MUTE. The low active master Mute I2C register and the MUTE terminal are
logically Or’ed together. If either is set to low, a mute on all channels is performed. The master mute command
operates on all channels regardless on whether the system is in six or eight channel configuration.
When MUTE is invoked, the PWM output stops switching and then goes to an idle state.
The master Mute terminal is used to support a variety of other operations in the TAS5518, such as setting the
inter-channel delay, the biquad coefficients, the serial interface format, and the clock rates. A mute command
by the master mute terminal, individual I2C mute, the AM interference mute sequence, the bank switch mute
sequence, or automute overrides an unmute command or a volume command. While a mute is active, the
commanded channels will be placed in a mute state. When a channel is unmuted, it goes to the last
commanded volume setting that has been received for that channel.
2.3
Device Configuration Controls
The TAS5518 provides a number of system configuration controls that are set at initialization and following
a reset.
Channel Configuration
Headphone Configuration
Audio System Configurations
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